1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde560fded6b4376f1aef5ba10da1ac2294ec3f4f8341d65e656d1de03797e64. Chain 2 (Bitcoin): anchored in block 954046 (2026-06-17T04:53:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4153dc49-ddf1-4eaf-9893-f4111ab9fc78.json and https://artists.proofprofile.net/proofs/artist/4153dc49-ddf1-4eaf-9893-f4111ab9fc78.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Litaniae de venerabili altaris sacramento, K. 243 (Digitally Remastered)
Mozart: Litinae de venerabili - Missa brevis - Offertorium
Wesley: Concerto No. 4 for Organ and Orchestra in C Major (Digitally Remastered)
Weber: Grand potpourri in D Major, Op. 20, J.64 (Digitally Remastered)
Tchaikovsky: Variations on a Rococo Theme, Op. 33 (Digitally Remastered)
Mudge: Concerto for Organ No. 4 in D Minor (Digitally Remastered)
Stanley: 6 Concertos in 7 Parts for Organ and Orchestra, No. 1 in D Major, Op. 2 (Digitally Remastered)
Mozart: Missa Brevis in F Major, K. 116 "Kyrie" (Digitally Remastered)
Scarlatti: Miserere (Digitally Remastered)
Scarlatti: Salve Regina in A Minor (Digitally Remastered)
Mozart: Rondo for Violin and Orchestra in C Major, K. 373 (Digitally Remastered)
Mozart: Rondo for Violin and Orchestra in B-Flat Major, K. 269 (Digitally Remastered)
Mozart: Missa Brevis No. 4 in D Major, K. 194 (Digitally Remastered)
Mozart: Concerto for Violin and Orchestra No. 2 in D Major, K. 211 (Digitally Remastered)
Mozart: Adagio for Violin and Orchestra in E Major, K. 261 (Digitally Remastered)
J.S. Bach: Canata, BWV 191 (Digitally Remastered)
Glazunov Quartet No 1 for 2 Violins, Viola, & Violoncello 1-4
Mozart Concerto for Violin No. 2 KV 211 (Single)